Negative conductances of Josephson junctions: Voltage fluctuations and energetics

Autor:	Machura, L., Kostur, M., Talkner, P., Hanggi, P., Luczka, J.
Rok vydání:	2009
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Statistical Mechanics
Zdroj:	Phys. E 42, p 590, (2010)
Druh dokumentu:	Working Paper
DOI:	10.1016/j.physe.2009.06.062
Popis:	We study a resistively and capacitively shunted Josephson junction, which is driven by a combination of time-periodic and constant currents. Our investigations concern three main problems: (A) The voltage fluctuations across the junction; (B) The quality of transport expressed in terms of the P\'eclet number; (C) The efficiency of energy transduction from external currents. These issues are discussed in different parameter regimes that lead to: (i) absolute negative conductance; (ii) negative differential conductance, and (iii) normal, Ohmic-like conductance. Conditions for optimal operation of the system are studied. Comment: 7 pages, 4 figures, Presented at the "Frontiers of Quantum and Mesoscopic Thermodynamics", 28 July - 2 August 2008, Prague, Czech Republic
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0902.3080 Zobrazit plný text záznamu View this record from Arxiv